gazebosim / gazebosim/sdf_tutorials

Should name attribute restrictions apply to custom elements?

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Description

The SDFormat 1.7 frame semantics proposal contains two restrictions on the contents of `//@name` attributes:

* [Names of sibling elements must be unique](http://sdformat.org/tutorials?tut=pose_frame_semantics_proposal&cat=pose_semantics_docs-2-unique-names-for-all-sibling-elements)
* [Certain reserved values may not be used in a `//@name`](http://sdformat.org/tutorials?tut=pose_frame_semantics_proposal&cat=pose_semantics_docs-3-reserved-names) (namely `world` and `__.*__`

Should these restrictions apply to a name attribute in a custom namespaced element?

Moved from this comment thread: https://github.com/osrf/sdformat/pull/381#pullrequestreview-518802131

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